Added Jenkinsfile and Dockerfile

Dockerfile

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+FROM node:16-alpine
+
+WORKDIR /app
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY ./.next /app/.next
+COPY ./public /app/public
+COPY ./res /app/res
+COPY ./node_modules /app/node_modules
+COPY ./next.config.js /app/next.config.js
+COPY ./package.json /app/package.json
+COPY ./yarn.lock /app/yarn.lock
+
+RUN npm install
+
+ENTRYPOINT npm start
+EXPOSE 3000

Jenkinsfile

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+#!groovy
+
+node {
+    stage('Checkout') {
+        checkout scm
+    }
+
+    stage('Prepare') {
+        sh 'git rev-parse --verify HEAD > GIT_COMMIT'
+        env.GIT_COMMIT = readFile('GIT_COMMIT').trim().substring(0, 10)
+        sh 'rm GIT_COMMIT'
+        def jobName = env.JOB_NAME.tokenize('/')
+        print env.jobName
+
+        // set env
+        env.DOCKER_NAME="${jobName[0]}/${jobName[1]}:${env.BRANCH_NAME}-${env.GIT_COMMIT}"
+        env.DOCKER_REGISTRY="docker.sebse.de"
+
+        env.NODEJS_HOME = "${tool 'node16'}"
+        env.PATH="${env.NODEJS_HOME}/bin:${env.PATH}"
+        env.NEXT_TELEMETRY_DISABLED=1
+
+        def customImage
+    }
+
+    /*stage('Test') {
+        env.NODE_ENV = "test"
+        print "Environment will be : ${env.NODE_ENV}"
+        sh 'node -v'
+        sh 'yarn install'
+        sh 'yarn test'
+    }*/
+
+    stage('Build Prod') {
+        env.NODE_ENV = "production"
+        print "Environment will be : ${env.NODE_ENV}"
+
+        sh 'node -v'
+        sh 'yarn install --production=false'
+        sh 'yarn run build'
+        sh 'rm node_modules -rf'
+        sh 'yarn install --production=true'
+    }
+
+    stage('Build Docker') {
+        customImage = docker.build(env.DOCKER_NAME)
+    }
+
+    stage('Deploy') {
+        echo 'Push to Repo'
+        docker.withRegistry("https://${DOCKER_REGISTRY}", 'docker-registry-robot-web-development') {
+            /* Push the container to the custom Registry */
+            customImage.push()
+        }
+    }
+
+    stage('Cleanup') {
+        echo 'prune and cleanup'
+        sh 'rm node_modules -rf'
+        sh "docker rmi ${env.DOCKER_NAME} ${DOCKER_REGISTRY}/${env.DOCKER_NAME}"
+        sh 'docker image prune -f'
+        sh 'docker rmi $(docker images -a | grep "<none>" | awk "{print \$3}") &2>/del/null || exit 0'
+    }
+}